EP0920012B1 - Magnetische plattenkassette - Google Patents

Magnetische plattenkassette Download PDF

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Publication number
EP0920012B1
EP0920012B1 EP96926594A EP96926594A EP0920012B1 EP 0920012 B1 EP0920012 B1 EP 0920012B1 EP 96926594 A EP96926594 A EP 96926594A EP 96926594 A EP96926594 A EP 96926594A EP 0920012 B1 EP0920012 B1 EP 0920012B1
Authority
EP
European Patent Office
Prior art keywords
magnetic disk
center
center core
magnetic
cassette shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96926594A
Other languages
English (en)
French (fr)
Other versions
EP0920012A1 (de
EP0920012A4 (de
Inventor
Seiichi Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Iomega Corp
Original Assignee
Fuji Photo Film Co Ltd
Iomega Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd, Iomega Corp filed Critical Fuji Photo Film Co Ltd
Publication of EP0920012A1 publication Critical patent/EP0920012A1/de
Publication of EP0920012A4 publication Critical patent/EP0920012A4/de
Application granted granted Critical
Publication of EP0920012B1 publication Critical patent/EP0920012B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/0301—Details
    • G11B23/0312—Driving features

Definitions

  • the present invention relates to a magnetic disk cartridge, more particularly to the structure of a center core for supporting the center portion of the magnetic disk of a magnetic disk cartridge having a rotatable magnetic disk encased in a cassette shell.
  • a magnetic disk cartridge comprises a magnetic disk for magnetically recording analog and/or digital signals rotatably encased in a thin cassette shell.
  • the cassette shell is formed in the shape of a flat prism (substantially a hexahedron) with a top surface slightly larger than the magnetic disk, a bottom surface having an opening through which a center core supporting the center of the magnetic disk is exposed and narrow side surfaces extending between the outer peripheral edges of the top and bottom surfaces.
  • the magnetic disk cartridge is provided with a magnetic head access opening for insertion/withdrawal of magnetic heads used for magnetic recording and reproducing so as to enable the magnetic heads to be brought into contact with, or close to, the opposite surfaces of the magnetic disk from the exterior.
  • the magnetic head access opening is equipped with a shutter member for preventing invasion of dust and the like when the magnetic disk cartridge is not in use.
  • the magnetic head access opening of the prior art magnetic disk cartridge is a slender opening of substantially rectangular shape formed in the top and bottom surfaces of the cassette shell to extend in the radial direction of the magnetic disk.
  • the magnetic head access opening it is not absolutely necessary for the magnetic head access opening to be formed in the top and bottom surfaces of the cassette shell to extend in the radial direction of the magnetic disk. Specifically, it can be provided at any location so long as it enables the magnetic heads to be brought in contact with, or close to, the opposite surfaces of the magnetic disk over the full radius thereof from the exterior.
  • the opening is preferably as small as possible so as to minimize invasion of dust into the cartridge.
  • the ability to fabricate smaller magnetic heads has afforded greater freedom in the positioning and sizing of the magnetic head access opening and has even made it possible to realize the desired small magnetic head access opening by providing the opening only in a side surface rather than in the top and/or bottom surface.
  • Such a magnetic disk cartridge having the magnetic head access opening formed in one side surface can accommodate a high-density, high-capacity magnetic disk. Since such a magnetic disk requires a high recording density and a high data transfer rate, it is adapted to conduct recording and reproducing while being rotated at high speed (several thousand rpm).
  • the center portion of the magnetic disk of the conventional thin magnetic disk cartridge is also supported by a center core made of ferromagnetic sheet material and the center core is rotated by a turntable which secures it in place by magnetic attraction.
  • the center core is formed with a polygonal hole at its center and with a separate polygonal hole at a peripheral portion.
  • a magnetic disk cartridge whose magnetic disk is rotated at high speed cannot tolerate rotational offset owing to slippage occurring between the turntable and the magnetic disk at the start or in the course of rotation and requires the magnetic disk to be rotated in a single plane (with a high degree of flatness).
  • EP 0667616A relates to a disc cartridge suitable for the containment of a magnetic disc, excellent in durability and easy to assemble.
  • a disadvantage of the construction of this disc cartridge is that the contact region between a driving device and the hub supporting the disc during chucking is larger than the magnet area and is, additionally, on different levels. This makes it difficult to achieve a flat contact surface to insure strong chucking and to prevent rotational offset with high reliability.
  • EP 0325399A discloses according to the preamble of the claim, an information recording medium comprising a disc substrate having an improved magnetic clamping hub.
  • FR 2337396A describes a magnetic disc cartridge with a magnetic disc comprising a central region having a central portion with a conical opening for receiving an adjusting pin from an external turntable.
  • the central region further comprises contact portions which are coupled to the central portion by a diaphragm which may act as a force coupling member in order to correctly centrally position the magnetic disc once an external adjusting pin is inserted into the opening.
  • a drawback of this disclosure is that a center core is not integrally formed of one piece such that there are disadvantages with respect to production costs and accuracy of contacting surfaces.
  • the object of this invention is to overcome the aforesaid problems by providing a magnetic disk cartridge wherein the center core of the magnetic disk can be chucked by the chucking magnet of a turntable to enable high-speed rotation of the center core without rotational slippage and with minimal vibration.
  • the invention provides a magnetic disk cartridge comprising a magnetic disk, a cassette shell encasing the magnetic disk to be rotatable therein, and a disk-shaped center core fabricated from sheet material which supports the center of the magnetic disk and is exposed through an open portion in the bottom surface of the cassette shell for rotation by a turntable equipped at an outer peripheral portion thereof with an annular chucking magnet for magnetically chucking the center core, wherein the cassette shell is formed as a flat prism with a top surface slightly larger than the magnetic disk, the bottom surface of approximately the same shape as, and lying parallel to, the top surface, and narrow side surfaces extending between outer peripheral edges of the top and bottom surfaces, a magnetic head access opening is formed in one side surface of the cassette shell for enabling magnetic reproducing and recording heads to be brought in contact with, or close to, opposite surfaces of the magnetic disk from the exterior, a center portion of the center core is formed with a center hole for engagement by a center locating pin of the turntable, and a peripheral portion of the center core is formed with a step
  • the magnetic head access opening of the magnetic disk cartridge can be made small to minimize invasion of dust and the like into the interior of the cartridge.
  • the center core of the magnetic disk cartridge is formed with a hole at only at its center. Owing to this center hole, the center of rotation of the magnetic disk can be regulated by engagement of the locating pin of the turntable with the center hole, while the absence of any other hole ensures excellent rotational balance, thereby enabling the magnetic disk to be rotated at high speed with minimal rotational vibration and high-performance recording and reproducing to be conducted with little modulation.
  • turntable torque is transmitted to the center core through an annular chucking magnet which is provided at an outer peripheral region of the turntable and magnetically chucks an annular chucking region of the center core. Since the torque is therefore transmitted at high efficiency to enable obtainment of a large driving force, the magnetic disk can be rotated without occurrence of slippage between the turntable and the center core at the start or in the course of rotation. This enables excellent recording and reproduction to be conducted by use of magnetic heads.
  • the chucking region of the center core is formed as an annular, step-like region on a different level from that at the mouth of the center hole, contact of the chucking magnet with portions it should not contact is positively avoided, the center core can be reliably seated by magnetic chucking, and a large chucking force can be secured through surface-to-surface contact.
  • the stepped configuration defining the mouth of the center hole and the chucking region of the center core at different levels is also advantageous in that it increases the rigidity of the center core, thereby minimizing deformation under exposure to external force, and enables the prescribed shape to be maintained with high precision after fabrication. Since the chucking region therefore has the high flatness required for broad surface-to-surface contact with the chucking magnet, it is strongly chucked by the chucking magnet to prevent rotational offset with high reliability.
  • FIGS 1 to 3 show a magnetic disk cartridge which is an embodiment of the invention.
  • the magnetic disk cartridge is shown in perspective view from the top with its shutter member open in Figure 1 and from the bottom with its shutter member closed in Figure 2.
  • Figure 3 is a sectional view showing the magnetic disk of the magnetic disk cartridge magnetically chucked to a turntable.
  • the magnetic disk cartridge 1 of this embodiment comprises a cassette shell 2 encasing a magnetic disk 3 so as to be freely rotatable therein.
  • the cassette shell 2 is formed of a pair of top and bottom cassette shell halves made of molded plastic.
  • the cassette shell 2 is formed substantially as a flat hexahedron having an approximately square top surface 21 slightly larger than the magnetic disk 3 encased therein, a bottom surface 22 of substantially the same shape as the top surface 21 and lying parallel thereto, and narrow side surfaces 23 extending between the outer peripheral edges of the top surface 21 and the bottom surface 22.
  • the center portion of the magnetic disk 3 (recording medium) is supported by a disk-shaped center core 31 pressed from ferromagnetic sheet material.
  • the center core 31 faces into a circular opening 2a in the bottom surface 22 of the cassette shell 2 (see Figure 2).
  • the center core 31 is chucked by a turntable 12, as shown in Figure 3, and rotated at high speed.
  • the turntable 12 is formed at the center of rotation with a locating pin 13 having a tapered tip and at an outer peripheral portion with an annular chucking magnet 14.
  • the center core 31 is formed at a center portion with a center hole 31a for engagement by the locating pin 13 of the turntable 12 and at an outer peripheral portion with an annular, step-like chucking region 31b whose level differs from that at the mouth of the center hole 31a.
  • the chucking region 31b is adapted to make surface-to-surface contact with the annular chucking magnet 14 at the outer peripheral region of the turntable 12.
  • a magnetic head access opening 6 enabling magnetic recording and reproducing heads to be brought in contact with, or close to, the opposite surfaces of the magnetic disk 3 from the exterior is formed in one side surface 4 among the four side surfaces 23 of the cassette shell 2.
  • a slidable shutter member 8 for opening and closing the magnetic head access opening 6 is provided on the cassette shell 2.
  • the shutter member 8 is constituted as a sectionally u-shaped metal sheet member comprising, as interconnected, an upper wing 81 extending along the top surface 21, a shutter section 82 extending along the one side surface 4 and a lower wing 83 extending along the bottom surface 22.
  • the shutter member 8 moves along these surfaces.
  • the shutter section 82 is provided with a shutter window 82a. It can therefore open and close the magnetic head access opening 6 depending on whether the magnetic disk cartridge 1 is in storage or operation.
  • portions of the top surface 21, the side surface 4 and the bottom surface 22 of the cassette shell 2 adjacent to the magnetic head access opening 6 are formed with a shallow recess 9 for retaining and guiding the upper wing 81, the shutter section 82 and the lower wing 83 of the shutter member 8.
  • the shutter member 8 is constantly biased in the direction of closing the magnetic head access opening 6 by a shutter closing spring (a torsion spring not shown in the drawings).
  • the shutter closing spring is inserted into the cassette shell 2 through a spring insertion opening 4a formed at one end portion of the side surface 4 of the cassette shell 2, a first end portion thereof engages with a spring engaging portion 82b provided at a lateral end portion of the shutter section 82 of the shutter member 8, and the other end portion thereof engages with the inner surface of the cassette shell.
  • the spring engaging portion 82b of the shutter member 8 passes through a slide groove 4b formed in the side surface 4 of the cassette shell 2.
  • the lower wing 83 of the shutter member 8 is formed at two locations with projecting guide claws 83a, 83a that engage with a guide groove 22a formed in the bottom surface 22 of the cassette shell 2 to extend in the sliding direction of the shutter member 8, thereby retaining the shutter member 8 on the cassette shell 2.
  • the magnetic disk cartridge 1 of this embodiment is used in the same manner as the prior-art magnetic disk cartridge. Specifically, it is loaded into the magnetic recording and reproducing device (hereinafter called simply "device") in the state shown in Figure 2, i.e. with the magnetic head access opening 6 closed by the shutter member 8. At this time, an operating member provided in the device responds to the loading operation by sliding the shutter member 8 to the open position shown in Figure 1. Then, when the operator performs a prescribed operation for removing the magnetic disk cartridge 1 from the device, for instance, when the operator presses a prescribed operating button of the device, the shutter member 8 is closed to the position shown in Figure 2.
  • the magnetic recording and reproducing device hereinafter called simply "device"
  • the device responds by moving the turntable 12 toward the center core 31 exposed at the bottom surface 22 of the cassette shell 2. Specifically, the tip of the locating pin 13 of the turntable 12 is engaged with center hole 31a of the center core 31 to regulate the position of the center of the center core 31 and, consequently, that of the magnetic disk 3, while the chucking surface of the chucking magnet 14 at the outer periphery of the turntable 12 is brought into surface-to-surface contact with the chucking region 31b of the center core 31 so as to strongly attract and secure the center core 31 at an annular region thereof.
  • the turntable 12 can rotate the magnetic disk 3 with little or no slippage (offset) in the direction of rotation.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Claims (1)

  1. Eine Magnetdiskette (1), welche aufweist:
    eine Magnetscheibe (3);
    eine Kassettenhülle (2), die die Magnetscheibe (3) umhüllt, um darin rotierbar zu sein; und
    einen scheibenförmigen zentralen Kern (31 ), der aus Schichtmaterial hergestellt ist, welcher das Zentrum der Magnetscheibe (3) stützt und durch einen offenen Bereich in einer unteren Oberfläche (22) der Kassettenhülle (2) für eine Rotation durch einen Drehtisch (12) offenliegt, der an einem äußeren Randbereich davon mit einem ringförmigen Einspannmagneten (14) für ein magnetisches Einspannen des zentralen Kerns (31) ausgestattet ist, wobei
    die Kassettenhülle (2) als ein flaches Prisma mit einer oberen Oberfläche (21), die etwas größer als die Magnetscheibe (3) ist, der unteren Oberfläche (22) von etwa der gleichen Form wie und parallel zu der oberen Oberfläche (21) liegend; und schmalen Seitenoberflächen (23) ausgebildet ist, die sich zwischen äußeren Randkanten der oberen und unteren Oberflächen (21, 22) erstrecken; und
    einer Magnetkopfzugriffsöffnung (6), die in einer Seitenoberfläche der Kassettenhülle (2) ausgebildet ist, um es Magnetwiedergabe- und -aufnahmeköpfen zu ermöglichen, in Kontakt mit oder nahe zu gegenüberliegenden Oberflächen der Magnetscheibe (3) von außen gebracht zu werden;
    wobei der zentrale Kern (31) mit einem runden Loch (31 a) an nur einem Bereich vorgesehen ist, wobei das runde Loch (31 a) sich an einem zentralen Bereich des zentralen Kerns (31) befindet und aus einem zentralen Loch (31 a) für ein Eingreifen durch einen zentralen Lagestift (13) des Drehtisches (12) ausgebildet ist;
    dadurch gekennzeichnet, dass
    ein Randbereich des zentralen Kerns (31) mit einem stufenförmigen ringförmigen Einspannbereich (31 b) ausgebildet ist, dessen Niveau sich von dem einer Öffnung des zentralen Loches (31 a) unterscheidet und welcher ausgebildet ist, um einen Oberflächenkontakt mit dem ringförmigen Einspannmagneten (14) herzustellen.
EP96926594A 1996-08-08 1996-08-08 Magnetische plattenkassette Expired - Lifetime EP0920012B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/JP1996/002239 WO1998007154A1 (fr) 1996-08-08 1996-08-08 Cartouche de disque magnetique
US08/708,304 US5761016A (en) 1996-08-08 1996-09-04 Magnetic disk cartridge

Publications (3)

Publication Number Publication Date
EP0920012A1 EP0920012A1 (de) 1999-06-02
EP0920012A4 EP0920012A4 (de) 1999-08-11
EP0920012B1 true EP0920012B1 (de) 2004-11-03

Family

ID=26437230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96926594A Expired - Lifetime EP0920012B1 (de) 1996-08-08 1996-08-08 Magnetische plattenkassette

Country Status (3)

Country Link
US (1) US5761016A (de)
EP (1) EP0920012B1 (de)
WO (1) WO1998007154A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2243786A1 (en) * 1997-07-31 1999-01-31 Yasushi Tomita Recording medium and disc cartridge
US6049520A (en) * 1997-12-30 2000-04-11 Lsi Logic Corporation Drive mechanism for rotating storage media
JP2001035115A (ja) * 1999-07-22 2001-02-09 Fuji Photo Film Co Ltd 磁気ディスク用センタコア
EP1346354A2 (de) * 2000-12-14 2003-09-24 Koninklijke Philips Electronics N.V. Gerät zum abtasten eines elektromagnetisch gehaltenen informationsträgers

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2337396A1 (fr) * 1975-12-31 1977-07-29 Honeywell Bull Soc Ind Conditionnement pour disque magnetique
US4224648A (en) * 1978-10-16 1980-09-23 Control Data Corporation Disc centering
JPS5869372U (ja) * 1981-11-04 1983-05-11 ソニー株式会社 磁気シ−ト装置
JPS6124877U (ja) * 1984-07-19 1986-02-14 ティーディーケイ株式会社 デイスクカ−トリツジ
US4920441A (en) * 1985-03-13 1990-04-24 Nippon Telegraph and Telehpone Corp. Flexible magnetic diskette
JPS62164657U (de) * 1986-04-07 1987-10-19
JPS63122955U (de) * 1987-02-02 1988-08-10
JP2537348Y2 (ja) * 1988-01-19 1997-05-28 三井石油化学工業株式会社 光ディスク
JP3036108B2 (ja) * 1991-04-25 2000-04-24 ソニー株式会社 ディスクカートリッジ
JP2821060B2 (ja) * 1992-06-03 1998-11-05 シャープ株式会社 光ディスクカートリッジ
EP0667616B1 (de) * 1994-02-15 2006-07-19 Mitsubishi Chemical Corporation Plattenkassette

Also Published As

Publication number Publication date
US5761016A (en) 1998-06-02
EP0920012A1 (de) 1999-06-02
WO1998007154A1 (fr) 1998-02-19
EP0920012A4 (de) 1999-08-11

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